you dont want to go to wide with the tires... yeah the contact patch will be bigger but you will lose lateral rigidity in the sidewall and your cornering will suffer ... unless its for a drag aplication then who gives a f**k about lateral rigidity...
generaly go for a sidewall configuration that looks like this |__|
too wide and you get this /__\ then the side wall will be sloppy
too thin and you get this \__/ looks *BLING* y0 but doesnt protect your rims at all